Answered on Jan 10th, 2011 at 4:28 PM
A seaman/crewman visa will not lead to U.S. citizenship. A seaman visa is a nonimmigrant visa. When you get a nonimmigrant visa, the U.S. government assumes you will perform a specific activity while you are in the U.S. You are therefore given a specialized visa authorizing that activity - and only that activity - for a specific, limited time. While green cards are permanent, all nonimmigrant visas are temporary. Additionally, from a strictly legal standpoint, getting a nonimigrant visa will not help you to get a green card, nor will it hurt you.